In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

NSW police chief's explosive Lindt text

NSW Police Commissioner Andrew Scipione sent this text to his deputy Cath Burn around the time of the fatal Lindt Cafe siege. Ms Burn transferred the text into an email, which she sent to herself at 10.37pm on the night of the December 2014 stand-off. It is not yet clear when the text was sent.

"Catherine, I have had a quick chance to talk to the SSG (Specialist Services Group) team that were forward tonight and it has become apparent that we should be preparing a fresh bid for new equipment that is necessary.

"Can you please make sure we get some advice from Mal as to new electronic images / audio / intelligence equipment that we may need for the future.

"I will need this soon in order to make sure we are appropriately prepared for the future. I'm happy to discuss in the morning. Thanks again for your hard work today, see you bright and early in the morning. Regards, Andrew."